The ALTERMOD statement is used to alter load modules that are generated before MVS/370 to make them compatible with the latest system. It only works with a PDS, not a PDSE.

Syntax -

//SYSIN     DD  *
[label] ALTERMOD OUTDD=DDname
		[LIST={YES|NO}]
/*

• OUTDD=DDname - Specifies the DDname of the PDS, which contains the load modules to be altered.
• LIST={YES|NO} - Specifies the altered members to be listed in the SYSPRINT dataset. When ignored, the default listing option from the EXEC PARM gets applied.

Practical Example -

Scenario - Alter all members in MATEPK.IEBCOPY.INPLOAD.

JCL -

----+----1----+----2----+----3----+----4----+----5----+
//MATEPKA  JOB (123),'MTH',CLASS=A,MSGCLASS=A,MSGLEVEL=(1,1),
//             NOTIFY=&SYSUID
//****************************************
//* ALTER ALL LOAD MODULES FROM INPUT PDS
//****************************************
//STEP10   EXEC PGM=IEBCOPY
//SYSPRINT DD SYSOUT=*
//SYSOUT   DD SYSOUT=*
//SYSDUMP  DD SYSOUT=*
//SYSUT1   DD DSN=MATEPK.IEBCOPY.INPLOAD,DISP=(OLD,KEEP)
//SYSUT2   DD UNIT=SYSDA,SPACE=(TRK,(5,1))
//SYSIN    DD *
    ALTERMOD OUTDD=SYSUT1 LIST=ALL
/*

Output -

Explaining Example -

• SYSUT1 DD DSN=MATEPK.IEBCOPY.INPLOAD - Specifies the PDS that has old load modules.
• SYSUT2 DD - Provides the buffer space to process the operation.
• SYSIN DD - Has the control statements for processing the input.
• ALTERMOD OUTDD=SYSUT1 - Used to alter the load module from SYSUT1 DSN.
• LIST=ALL - Prints altering modules list in SYSPRINT.

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